练习十
文章： Artificial intelligence (AI) is rapidly advancing and transforming various industries. From healthcare to finance, AI technologies are being used to improve efficiency, accuracy, and decision-making. In healthcare, AI can assist in diagnosing diseases, analyzing medical data, and developing personalized treatment plans. In finance, AI can help with risk assessment, fraud detection, and investment strategies. However, the widespread use of AI also raises ethical concerns, such as privacy issues and the potential for bias in decision-making algorithms. It is crucial for society to establish guidelines and regulations to ensure the responsible development and use of AI, while also maximizing its benefits.

题目： What is the main idea of the passage? A. The applications of AI in different industries. B. The benefits of AI in improving efficiency. C. The ethical concerns related to AI. D. The impact of AI on society.

答案：D

解析：文章主要讨论了人工智能对社会的影响，包括其在不同行业的应用、带来的好处以及引发的伦理问题，因此选项D“人工智能对社会的影响”是文章的主旨.

练习十一
文章： Urbanization is a global trend that has significantly changed the way people live and work. As cities continue to grow, they offer numerous opportunities for economic development and cultural exchange. However, urbanization also brings challenges, such as overcrowding, pollution, and the strain on public services. To address these issues, cities need to implement sustainable urban planning and development strategies. This includes improving public transportation systems, promoting green spaces, and ensuring access to affordable housing. By doing so, cities can enhance the quality of life for their residents and create a more sustainable urban environment.

题目： What does the passage mainly discuss? A. The opportunities brought by urbanization. B. The challenges of urbanization. C. The process of urbanization. D. The strategies for sustainable urban development.

答案：D

解析：文章主要讨论了可持续城市发展的策略，包括城市化带来的机遇和挑战以及应对措施，因此选项D“可持续城市发展的策略”是文章的主旨.

练习十二
文章： The sharing economy has emerged as a significant economic model in recent years. It involves the exchange of goods and services between individuals through online platforms, without the need for traditional ownership. This model has disrupted traditional industries, such as transportation and accommodation, by offering more affordable and flexible options. Companies like Uber and Airbnb have become prominent examples of the sharing economy. However, the sharing economy also faces regulatory challenges and concerns about the rights of workers. To ensure its continued growth and success, it is important for the sharing economy to adapt to regulations and prioritize the well-being of its participants.

题目： What is the passage mainly about? A. The definition of the sharing economy. B. The impact of the sharing economy on traditional industries. C. The challenges faced by the sharing economy. D. The development and challenges of the sharing economy.

答案：D

解析：文章主要讨论了共享经济的发展及其面临的挑战，包括其定义、对传统行业的影响以及监管和劳动者权益等问题，因此选项D“共享经济的发展及其挑战”是文章的主旨.